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- W2026103344 abstract "Photoabsorption in atoms is analysed in terms of the diagram expansion for the polarization propagator. The author uses basis wave functions calculated in an effective Hartree-Fock potential. Without approximations he derived the Fano formula sigma ( omega )/ sigma c( omega )=1- rho 2+ rho 2(( epsilon +q)2/( epsilon 2+1)) for autoionizing resonances. The line shape parameters are expressed in terms of reducible (screened) quantities like the self-energy, the generalized dipole matrix element and the background polarizability. The parameters can be expanded in perturbation series involving the infinite set of channels that forms the excitation spectrum for the atomic system." @default.
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- W2026103344 title "Atomic resonances from a many-body point of view" @default.
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- W2026103344 doi "https://doi.org/10.1088/0022-3700/3/4/002" @default.
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